Memory leak in span_processing_xxx metrics

[Yyukan]

• http4s version 0.20.x
• kamon http4s version 1.0.11

We noticed a memory leak in span_processing_time_seconds_xxx metrics in the field "parent"

[ivantopo]

hey @Yyukan, if you keep digging inside that parent member, could you please show us what is being referenced from there?

[Yyukan]

hey @ivantopo it is hard to say, but here is screenshot

Looks like every request Kamon.currentContext() is updated with the new span child and never being released (SpanBuilder#joinParentContext(..))

[ntngel1]

I'm joining here guys, faced this problem too, several hours of runtime in production and then service dies because of OOM.